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LT3082ETS8 Datasheet(PDF) 9 Page - Linear Technology |
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LT3082ETS8 Datasheet(HTML) 9 Page - Linear Technology |
9 / 20 page LT3082 9 3082f APPLICATIONS INFORMATION Table 1. 1% Resistors for Common Output Voltages VOUT (V) RSET (k) 1 100 1.2 121 1.5 150 1.8 182 2.5 249 3.3 332 5 499 With a 10μA current source generating the reference voltage, leakage paths to or from the SET pin can create errors in the reference and output voltages. High qual- ity insulation should be used (e.g., Teflon, Kel-F). The cleaning of all insulating surfaces to remove fluxes and other residues may be required. Surface coating may be necessary to provide a moisture barrier in high humidity environments. Minimize board leakage by encircling the SET pin and circuitry with a guard ring that is operated at a potential close to itself. Tie the guard ring to the OUT pin. Guarding both sides of the circuit board is required. Bulk leakage reduction depends on the guard ring width. 10nA of leak- age into or out of the SET pin and its associated circuitry creates a 0.1% reference voltage error. Leakages of this magnitude, coupled with other sources of leakage, can cause significant offset voltage and reference drift, es- pecially over the possible operating temperature range. Figure 2 depicts an example guard ring layout. If guard ring techniques are used, this bootstraps any stray capacitance at the SET pin. Since the SET pin is a high impedance node, unwanted signals may couple into the SET pin and cause erratic behavior. This will be most noticeable when operating with minimum output capacitors at full load current. The easiest way to remedy this is to bypass the SET pin with a small amount of capacitance from SET to ground; 10pF to 20pF is sufficient. Stability and Output Capacitance The LT3082 requires an output capacitor for stability. It is designed to be stable with most low ESR capacitors (typically ceramic, tantalum or low ESR electrolytic). A minimum output capacitor of 2.2μF with an ESR of 0.5Ω or less is recommended to prevent oscillations. Larger values of output capacitance decrease peak deviations and provide improved transient response for larger load current changes. Bypass capacitors, used to decouple individual components powered by the LT3082, increase the effective output capacitor value. For improvement in transient response performance, place a capacitor across the voltage setting resistor. Capacitors up to 1μF can be used. This bypass capacitor reduces system noise as well, but start-up time is proportional to the time constant of the voltage setting resistor (RSET in Figure 1) and SET pin bypass capacitor. Give extra consideration to the use of ceramic capacitors. Ceramic capacitors are manufactured with a variety of di- Figure 2. Example Guard Ring Layout for DFN Package 3082 F02 OUT GND SET |
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